EP0738211A1 - Improvements in or relating to a sheet offset press - Google Patents

Improvements in or relating to a sheet offset press

Info

Publication number
EP0738211A1
EP0738211A1 EP95905835A EP95905835A EP0738211A1 EP 0738211 A1 EP0738211 A1 EP 0738211A1 EP 95905835 A EP95905835 A EP 95905835A EP 95905835 A EP95905835 A EP 95905835A EP 0738211 A1 EP0738211 A1 EP 0738211A1
Authority
EP
European Patent Office
Prior art keywords
brush
box
gaps
brush material
sheets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP95905835A
Other languages
German (de)
French (fr)
Other versions
EP0738211B1 (en
Inventor
Kjell Pettersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ACROTEC AB
IVT Graphics AB
Original Assignee
ACROTEC AB
IVT Graphics AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ACROTEC AB, IVT Graphics AB filed Critical ACROTEC AB
Publication of EP0738211A1 publication Critical patent/EP0738211A1/en
Application granted granted Critical
Publication of EP0738211B1 publication Critical patent/EP0738211B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/0403—Drying webs
    • B41F23/0406—Drying webs by radiation
    • B41F23/0413—Infrared dryers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
    • B41F23/044—Drying sheets, e.g. between two printing stations
    • B41F23/0443—Drying sheets, e.g. between two printing stations after printing

Definitions

  • the present invention relates to an apparatus for offset presses and includes an air-infra-red (IR) drying box, through which ready-printed sheets are caused to be conveyed with the aid of gripping means, for the purpose of drying pigment deposited on the sheets.
  • IR air-infra-red
  • the object of the present invention is to achieve an effective heat barrier in offset presses, the barrier allowing the gripping means to pass while at the same time preventing the heat radiation from the IR lamps from spreading to the different machine parts of the press.
  • the inventive heat barrier comprises heat resistant brush material arranged at the gaps laterally delimiting an air-IR drying box and its IR lamps, this box being mounted on an offset press.
  • This brush material is made from a heat-resisting sub ⁇ stance, which is also heat-insulating and flexible. It is therefore possible to mount and adjust mutually opposing lengths of the brush material such as to comp ⁇ letely cover the gaps laterally delimiting the box, while allowing passage of gripping means through it, since filaments of brush material will be deflected as respective portions of the gripping means come into contact with them, and will return immediately to their original attitudes after passage of the gripping means.
  • the brush material does not cause any damage to the portions of the gripping means with which it engages, and it can be supplied with relatively long brush fila ⁇ ments that can be trimmed to a suitable length on in ⁇ stallation.
  • a brush comprising the brush material may be fastened to a rail, which is flexible in the conveying direction of the sheets, curved guides used with the gripping means thus not causing any prob ⁇ lem.
  • the air-IR drying box 1 intended for mounting on an offset press, is adapted to accept ready-printed sheets 2 for drying the pigment deposited thereon, these sheets being conveyed with the aid of gripping means 3.
  • IR lamps 12 are mounted in the box 1 in given, spaced relationship, and in the illu- strated example, in the conveying direction of the sheets 2.
  • the gaps 4 and 5 laterally delimiting the box 1 are each screened by at least brush means 6 extending in the conveying direction 7 of the sheets 2 and comp ⁇ rising respective brush material 8, 9 and 10, 11 for closing off the respective gap and preventing the spread of IR radiation and hot air generated by the IR lamps in the box 1 to different components of the off ⁇ set press.
  • the laterally delimiting gaps 4 and 5 between the respective side elements are each screened off by brush means 6 extending in the conveying direc- tion.
  • the brush material 8-11 of the means 6 is both heat-resistant and heal-insulating, as well as having a flexibility permitting the gripping means 3 to pass.
  • the filaments in the respective mutually opposed brush means 6 have their outer, free portions 15, 15', 16, 16', mutually, opposingly directed and preferably ex ⁇ tend completely across the gaps 4 and 5 such as effec ⁇ tively to close off the gaps.
  • outer free portions 15; 15'; 16; 16' of the respective brush material 8-11 are mutually contiguous along a line 23, which is at the same level as the central point of, and conveying path for the portions 13, 14 of a gripping means 3, these portions being intended to be taken through, bet ⁇ ween and along brush means 6 as the gripping means 3 is advanced through the air-IR drying box 1.
  • the outer free portion of the brush material 8-11 of the respec ⁇ tive brush means 6 preferably extends over the entire gaps 4 and 5 both from above and below such as to meet along the middle of the respective gap.
  • the brush material 8-11 may be fastened to a rail, which is flexible in the sheet conveying direction 7.
  • the brush material 8-11 By reason of the great flexibility of the brush material 8-11 it is possible to adjust it so that opposing filaments touch a passing gripping means 3, merely deflecting the filaments until it passes between them, subsequent to which they imme ⁇ diately return to their original attitudes.
  • the brush material can be delivered with relatively long fila ⁇ ments, for clipping to appropriate length on installa ⁇ tion.
  • the preferred embodiment of the air-IR box 1 illustrated on the drawing includes an upper, water- cooled reflector 17, having connections 18, 19 for cooling water.
  • the lower part of the box 1 includes an IR lamp array 20, and in the illustrated embodiment cold air, via connections 21 and 22, is used to cool it. It is of course also possible to an inverted set-up with the reflector 17 below and the array 20 above, such as to obtain fully effective function.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Drying Of Solid Materials (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Abstract

The invention relates to an apparatus for offset presses, and includes an air-IR drying box (1), through which ready-printed sheets (2) are caused to be conveyed with the aid of gripping means (3), for the purpose of drying pigment deposited on the sheets. The box (1) has screening means along gaps (4, 5) delimiting it laterally, the screening means being implemented as at least one brush means (6) having brush material (8-11) covering the gaps (4, 5) and extending perpendicularly to the conveying direction (7) for preventing the spread of heat radiation and hot air from the IR lamps (12) in the box (1) to different machine parts of the press.

Description

IMPROVEMENTS IN OR RELATING TO A SHEET OFFSET PRESS
The present invention relates to an apparatus for offset presses and includes an air-infra-red (IR) drying box, through which ready-printed sheets are caused to be conveyed with the aid of gripping means, for the purpose of drying pigment deposited on the sheets.
A continually recurring problem with the installation of IR drying boxes in offset presses is that the IR lamps radiate to some extent heat up metallic parts of the press, including its frame sides and the gripping means conveying the sheets. Several attempts have al- ready been made to screen off the IR lamps, but the problem lies with the gripping means that have to pass the place where the box is mounted.
The object of the present invention is to achieve an effective heat barrier in offset presses, the barrier allowing the gripping means to pass while at the same time preventing the heat radiation from the IR lamps from spreading to the different machine parts of the press. The distinguishing features of the invention are disclosed in the accompanying claims.
Due to the present invention there has now been achi¬ eved an effective heat barrier in offset presses of the kind mentioned in the introduction, the barrier ful- filling its purpose in an excellent manner, while at the same time it is both simple and cheap to manufact¬ ure, as well as easy to fit. The inventive heat barrier comprises heat resistant brush material arranged at the gaps laterally delimiting an air-IR drying box and its IR lamps, this box being mounted on an offset press.
This brush material is made from a heat-resisting sub¬ stance, which is also heat-insulating and flexible. It is therefore possible to mount and adjust mutually opposing lengths of the brush material such as to comp¬ letely cover the gaps laterally delimiting the box, while allowing passage of gripping means through it, since filaments of brush material will be deflected as respective portions of the gripping means come into contact with them, and will return immediately to their original attitudes after passage of the gripping means. The brush material does not cause any damage to the portions of the gripping means with which it engages, and it can be supplied with relatively long brush fila¬ ments that can be trimmed to a suitable length on in¬ stallation. In addition, a brush comprising the brush material may be fastened to a rail, which is flexible in the conveying direction of the sheets, curved guides used with the gripping means thus not causing any prob¬ lem.
The invention will now be described in more detail with the aid of a preferred embodiment example and with reference to the accompanying drawing, which depicts a schematic, perspective view of an air-IR drying box installed on an offset press.
As will be seen from the drawing, the air-IR drying box 1, intended for mounting on an offset press, is adapted to accept ready-printed sheets 2 for drying the pigment deposited thereon, these sheets being conveyed with the aid of gripping means 3. IR lamps 12 are mounted in the box 1 in given, spaced relationship, and in the illu- strated example, in the conveying direction of the sheets 2. The gaps 4 and 5 laterally delimiting the box 1 are each screened by at least brush means 6 extending in the conveying direction 7 of the sheets 2 and comp¬ rising respective brush material 8, 9 and 10, 11 for closing off the respective gap and preventing the spread of IR radiation and hot air generated by the IR lamps in the box 1 to different components of the off¬ set press. According to the preferred embodiment example depicted on the drawing, the laterally delimiting gaps 4 and 5 between the respective side elements are each screened off by brush means 6 extending in the conveying direc- tion. The brush material 8-11 of the means 6 is both heat-resistant and heal-insulating, as well as having a flexibility permitting the gripping means 3 to pass. The filaments in the respective mutually opposed brush means 6 have their outer, free portions 15, 15', 16, 16', mutually, opposingly directed and preferably ex¬ tend completely across the gaps 4 and 5 such as effec¬ tively to close off the gaps. These outer free portions 15; 15'; 16; 16' of the respective brush material 8-11 are mutually contiguous along a line 23, which is at the same level as the central point of, and conveying path for the portions 13, 14 of a gripping means 3, these portions being intended to be taken through, bet¬ ween and along brush means 6 as the gripping means 3 is advanced through the air-IR drying box 1. The outer free portion of the brush material 8-11 of the respec¬ tive brush means 6 preferably extends over the entire gaps 4 and 5 both from above and below such as to meet along the middle of the respective gap. To enable the use of curved gripping means guides the brush material 8-11 may be fastened to a rail, which is flexible in the sheet conveying direction 7. By reason of the great flexibility of the brush material 8-11 it is possible to adjust it so that opposing filaments touch a passing gripping means 3, merely deflecting the filaments until it passes between them, subsequent to which they imme¬ diately return to their original attitudes. The brush material can be delivered with relatively long fila¬ ments, for clipping to appropriate length on installa¬ tion. The preferred embodiment of the air-IR box 1 illustrated on the drawing includes an upper, water- cooled reflector 17, having connections 18, 19 for cooling water. The lower part of the box 1 includes an IR lamp array 20, and in the illustrated embodiment cold air, via connections 21 and 22, is used to cool it. It is of course also possible to an inverted set-up with the reflector 17 below and the array 20 above, such as to obtain fully effective function.

Claims

Claims
1. Apparatus for offset presses, comprising an air- infra-red (IR) drying box (1) , through which ready- printed sheets (2) are arranged for conveyance with the aid of gripping means (3) for drying pigments deposited on the sheets, characterized in that the box (1) has screening means along gaps (4, 5) delimiting it later¬ ally, said screening means being implemented as at least one brush means (6) having brush material (8-11) covering said gaps and extending perpendicularly to the conveying directing (7) of the sheets 2, such as to prevent the spread of heat radiation and hot air gene¬ rated by IR lamps 12 in the box (1) to different mach- ine parts of the press.
2. Apparatus as claimed in claim 1, characterized in that the brush material (8-11) of the brush means (6) is both heat-insulating and heat-resistant as well as possessing a flexibility, which permits the gripping means (3) to pass.
3. Apparatus as claimed in claim 1, characterized in that the respective gap (4, 5) laterally delimiting the box 1 is provided with two opposing brush means (6) , the respective brush material (8, 9; 10, 11) of which has its free outer portion (15, 15'; 16, 16') directed towards the corresponding free outer portion of the contiguous brush material, these opposing brush mate- rial filaments preferably extending completely over said gaps (4, 5) to cover them.
4. Apparatus as claimed in claim 3, characterized in that the outer free end portions (15; 15'; 16, 16') of the respective brush material are mutually contiguous along a line 23, which is at the same level as the central line of, and conveying path for the portions (13, 14) of a gripping means (3), these portions being intended to be taken through, between and along the brush means (6) as the gripping means 3 is advanced through the air-IR drying box 1.
5. Apparatus as claimed in claim 3, characterized in that the outer free end portions (15, 15'; 16, 16') of the brush material (8-11) pertaining to the respective brush means 6 extend over the entire height of the gaps (4, 5) delimiting the box 1 laterally, both from above and below such as to meet along the middle of the gaps.
6. Apparatus as claimed in any one of the preceding claims, characterized in that the brush material (8-11) is fastened to a rail, which is flexible in the convey- ing direction of the sheets.
EP95905835A 1993-12-30 1994-12-29 Improvements in or relating to a sheet offset press Expired - Lifetime EP0738211B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9304337A SE9304337L (en) 1993-12-30 1993-12-30 Device for a sheet-offset press with IR air ramp
SE9304337 1993-12-30
PCT/SE1994/001265 WO1995018017A1 (en) 1993-12-30 1994-12-29 Improvements in or relating to a sheet offset press

Publications (2)

Publication Number Publication Date
EP0738211A1 true EP0738211A1 (en) 1996-10-23
EP0738211B1 EP0738211B1 (en) 1998-05-27

Family

ID=20392260

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95905835A Expired - Lifetime EP0738211B1 (en) 1993-12-30 1994-12-29 Improvements in or relating to a sheet offset press

Country Status (8)

Country Link
US (1) US5778788A (en)
EP (1) EP0738211B1 (en)
JP (1) JPH09507179A (en)
AU (1) AU1429595A (en)
DE (1) DE69410638T2 (en)
ES (1) ES2118555T3 (en)
SE (1) SE9304337L (en)
WO (1) WO1995018017A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5966836A (en) * 1997-04-11 1999-10-19 Howard W. DeMoore Infrared heating apparatus and method for a printing press
SE514657C2 (en) * 1998-12-23 2001-03-26 Baldwin Ivt Ab Device at a sheet-offset press
AU2002239548A1 (en) 2000-12-01 2002-06-11 Technotrans Amercia West, Inc. Integral expander support brackets for air knife drier cassettes
US7389587B2 (en) * 2005-09-08 2008-06-24 Helen Of Troy Limited Utility knife

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1361977A (en) * 1920-05-10 1920-12-14 Frederick C Fuller Insulating screen or curtain
US2724908A (en) * 1953-08-24 1955-11-29 Gen Electric Oven construction
US4146974A (en) * 1977-09-19 1979-04-03 Pray Robert W Drying apparatus
US4287826A (en) * 1979-03-30 1981-09-08 Brabec Michael W Method and apparatus for screen printing
US4370534A (en) * 1979-04-09 1983-01-25 Deryck Brandon Apparatus and method for heating, thawing and/or demoisturizing materials and/or objects
US4646446A (en) * 1985-11-04 1987-03-03 American Screen Printing Equipment Company UV curing apparatus
US4773167A (en) * 1986-05-19 1988-09-27 Amjo Infra Red Dryers, Inc. Heater
US5259124A (en) * 1988-06-15 1993-11-09 Poterala Robert J Open top compact dryer oven for a web
US5085680A (en) * 1990-09-04 1992-02-04 Ppg Industries, Inc. Deformable side seal for furnaces and method for using
US5537925A (en) * 1993-09-03 1996-07-23 Howard W. DeMoore Infra-red forced air dryer and extractor

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9518017A1 *

Also Published As

Publication number Publication date
ES2118555T3 (en) 1998-09-16
SE501057C2 (en) 1994-10-31
AU1429595A (en) 1995-07-17
EP0738211B1 (en) 1998-05-27
DE69410638D1 (en) 1998-07-02
DE69410638T2 (en) 1998-12-24
WO1995018017A1 (en) 1995-07-06
JPH09507179A (en) 1997-07-22
US5778788A (en) 1998-07-14
SE9304337L (en) 1994-10-31
SE9304337D0 (en) 1993-12-30

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